faemer



(No Model.) 2 Sheets-Sheet 1.

M. G. PARMER.

TELEPHONE REPEATER. No. 351,257. Patented Oct. 19,- 1886.

E A W Er. I! AM G: [or mai 3,

2 Sheets-Sheet 2.

M. G. FARMER.

(No Modgl.)

TELEPHONE REPEATER.

Patented Oct. 19, 1886.

Zine 1" WITNESSES INVENTOR WEJLunZew-Lmwn- M W flttorneys ET R Phuh-Lilhogmpher, Washington, D. Cv

UNITED STATES PATENT OFFICE.

MOSES G. FARMER, OF NEW YORK, N. Y.

TELEPHONE-REPEATER.

EPECIFICATION forming part of Letters Patent No. 351,257, dated @otooer 19, 1886.

Application filed June 11, 1886.

T aZZ whom it may concern.-

Be it known that I, MosEs G. FARMER, a citizen of the United States, and a resident of New York, in the county and State oflNew York, have invented certain new and useful Improvements in Telephone-Repeaters, of which the following is a specification, reference being had to the drawings accompanying and t'orn'iing a part of the same.

My invention is an improvement in elec trical apparatus of the kinds known as re lays and repeaters. It is an instrument which, though primarily designed as a telephone-repeater, is adapted for use generally and with but slight modifications for making 1 and breaking a local circuit or for repeating in one circuit interruptions or variations of the current in another.

The instrument consists of two main parts or members which are respectively connected with or included in the two circuits with which the device is used. One of these parts or members an electro-niagnet of special construction,which is connected with the primary or independent circuit. The otheris an arrangement of contacts which are operated upon by the eleetro-inagnet, and which are included in the secondary or dependent circuit.

In so far as the construction or disposition of the contacts is concerned, many modifications are possible within my invention. For example, it the contacts be movable terminals normally out of contact, the instrument maybe used as a relay or telegraphic repeater. On the other hand,.if the contacts are of carbon, or carbon and metal, or metal alone, and are maintained in light but permanent contact, the device becomes available as a telephonic repeater.

The electromagnetic or primary part of the device consists of two concentric helices, either or both of which maybe divided into a number ot'scctions or independent coils. Within the inner helix is a stationary soft-iron core composed of a number of separated or mag netically insulated tubular sections. \Vithin the section. are armatures, all of which are secured to a rod or tube, which is connected with the contacts or otherwise arranged to transmit its movements or vibrations to one or more of the contacts.

Serial No. $104,837. (No model.)

i In the application to devices of this general character of a series of small armatures in fixed relation to each other and co-operating upon the contacts, I have the special object in View of securing the maximum mobility and positiveness of action with the minimum of'inert-ia. I have found that by this plan Iobtain a device much better suited to the reproduction of telephonic impulses, and better adapted generally to rapid telegraphing than by using a single armature, as has hitherto been done. The precise construction of the armatures and magnet may be varied in many ways, as will more fully appear from the following description.

I have represented in. the drawings the invention as applied to a telephonic apparatus; but analogous uses will readily suggest them- 7c. selves.

Figure 1 is a plan view of my improved telephone apparatus. Fig. 2 is a vertical central section of the same. Fig. 3 is a diagram of the circuit-connections and sectional view 7 5 of the instrument previously referred to.

A B are two circular heads of insulating material, or partly of metal and partly ofinsir lat-ing material, secured together by rods 0. Between the two heads or plates A B are the coils comprising the helices, of which the inner coil, D, is of comparatively coarse wire with but few turns 01' layers, while the other coil, E, is of finer wire with a larger number of turns or layers. The coil E may fit loosely 8 5 over the coil D, and may be, and in the pres ent case is, divided up into a number of sections connected together. The coil D surrounds a stationary tubular core composed of the soft-iron sections F F. The sections F are shouldered at each end, and held apart by the brass or non-magnetic rings f, the core being built up in this way and held firmly together by the heads A. B. Within this tubular seeby a light brass or non-magnetictube, H. The armatures G are short tn bcs of soft iron formed with flanges g, or in any other manner so as to contain a greater mass of iron at their upper ends. within the sections F, and are separated from each other by interposed rings of a nonmagnetic metal, 9. The armatures are secured to the tube H, and the sections F placed over tional core is a series of armatures, G, carried 5' They are of a diameter to fit loosely IOO them in building up the core, so that the heads or flanges y will be contained in the spaces between the sections F, and be capable of such movement as will permit a limited longitudinal movement of the tube H through the core.

The tube H is supported by some means that permit it to be moved longitudinally more or less, according to the purpose for which it is to be used; and it is forced down either by its own weight and that of the armatures which it carries or by a slightly-resilient attachment. In the present case its upper end is secured to a strip of miea, I, secured to the upper face of the head A, over a central perforation therein. Its lower end extends down through the head I), and is held in position by two or more thin flexible metal straps, N.

The armatures or cylinders G, I face with a non-magnetic substancesuch as copper or brassto prevent adhesion with the sections F by residual magnetism in case of contact, and I make them very light in comparison with the sections F.

To the upper end of the tube or rod H, or to the mica strip I, is secured a metallic cup, K, containing a carbon button, 2'. Upon this rests a metal electrode or contact, L, which is a small platinum pin passed through the end of a thin resilient metal strip, M. Upon this rests a carbon button, P, in a socket carried by a resilient metal strip, 0. The cup or socket K is electrically connected with a binding-post, K, and the strips M O are supported by adjlisting-holders M O of any suitable construction, which are electrically connected together and to the bindingpost B. Other bindlug-posts, as S S, are placed on the base of the instrument-two for the inner and two for the outer coils.

In preparing the instrument for use, the intermediate contact, L, is adjusted so as to press lightly upon the lower contact, 2', and

the upper contact is set so as to justtouch the contact L.

\Vhcn in operation, the coil D is connected up with asmall battery, T, which furnishes sufficient current to magnetize the cores. The outer coils, E, are connected up in the primary or independent line T, and the first part of the secondary or dependent. line, which in practice is the primary circuit of an inductioneoil, is made through the contacts by connecting it with the parts K It. The eii'ect of the current flowing through the coil D is to magnetize both the sections F of the stationary core and the armatures contained within them, and by reason of their relative positions to impart the same polarity to their corresponding or adjacent ends. The upper end of each inner core or armature, being larger than the lower, and being also somewhat nearer to the lower end of the stationary section next above, is attracted by the core above and repelled by that surrounding it. The current impulses in the coil E, acting upon the core thus affected, tend to produce, by means of this conjoint attraction and repulsion, a movement or vibration of the inner cores 0r armatures in line with their axis, which vibrations, being imparted to the contacts, reproduce in the secondary or dependent circuit corresponding impulses.

The precise construction of the cores and helices may be considerably varied without departing from the invention.

In another application I have shown and described an axial magnet of substantially the same construction as that herein shown. In the case referred to the magnet is described and claimed in conjunction with the diaphragm of a telephone-receiver; but having found that in combination with the electrodes of a repeater or relay this form of magnet has a peculiar advantage, owing to its capacity for rapid and positive working under the influence of feeble current impulses, I have made this latter combination the subject of this separate application.

\Vhat I claim is 1. In an instrument of the kind described, the combination, with electrical contacts or electrodes, of a series of armatures rigidly connected together and operating upon the contacts, and coils for imparting movement to the armatures, the contacts and coils being in in dependent circuits, as herein set forth.

2. The combination, with electrical contacts or electrodes, of a series of rigidly-connected armatures or cores, a local helix for magnetizing the cores, and a line-helix for imparting movement to them and through them to the electrodes, as set forth.

3. The combination, with the contacts or electrodes of a repeating-instrument, of a local magnetizinghelix and a linc helix, a sta tionary sectional core within the local helix, anda series of rigidly-connected armatures or cores in position to be operated upon by the sections of the stationary cores and operatively connected with the electrodes, as set forth.

a. In a telephone or similar repeater, the combination, with contacts or electrodes included in the secondary or independent circuit, of a local magnetizing-helix, a surrounding line-helix, a stationary sectional core within the local helix, and a series of armatures secured to a rod or tube connected to one of the electrodes, as herein set forth.

MOSES G. FARMER.

\V it n esses:

TIMo. DAME, M. F. KEEFE. 

